Most Internet providers will set up a POP account
on their server for you. You will have to connect once
in a while to retrieve your mail.
In this case, sendmail and UUCP shine. Ask your
provider for a UUCP account also. This is especially true
if you are part of a small organization. This will provide a
personal account on your server for everyone in your group
and your computer will forward/receive email to/from your provider.
Of course, nothing beats a permanent connection to the Internet...